BTW, You won't put much of a dent (small one) in an FMJ that way, though it will move lead just fine. You may discover you have a two-step process in which you need to put a cannelure in the bullets and use the profile crimp die, both. Just depends on how much recoil you actually generate and how heavy the gun is. That last point matters a lot. It's the fellows with ultra lightweight revolvers who get into the most trouble with this, as already mentioned.